Differential decompression DC chopper type high-frequency chain inverter

A DC chopper and inverter technology, which is applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, instruments, etc., can solve the problems of unsatisfactory conversion efficiency of high-frequency chain inverters, etc. Achieve the effect of low cost, high power density and strong load adaptability

Active Publication Date: 2014-03-26
FUZHOU UNIV
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Problems solved by technology

Therefore, the conversion efficiency of the high-frequency link inverter is not ideal, the fundamental reason is that it belongs to the cascaded two-stage circuit structure

Method used

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  • Differential decompression DC chopper type high-frequency chain inverter
  • Differential decompression DC chopper type high-frequency chain inverter
  • Differential decompression DC chopper type high-frequency chain inverter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The differential step-down (Buck) DC chopper type high-frequency chain inverter circuit structure of the present invention is composed of two identical high-frequency electrical isolation circuits that output low-frequency positive and negative half-cycle unipolar sinusoidal pulse width modulation voltage waves respectively. The bidirectional step-down (Buck) DC chopper is composed of a differential circuit, and an AC LC filter is connected between the positive output terminals of the two high-frequency electrical isolation bidirectional step-down DC choppers, and the two high-frequency electrical isolation bidirectional step-down The negative output terminal of the voltage DC chopper is grounded, the output load is connected in parallel at both ends of the filter capacitor, and a DC LC filter is connected between the input DC power supply and the...

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Abstract

The invention relates to a differential buck direct current chopper type high frequency link inverter which is provided with a circuit consisting of two same high frequency electric insulation bidirectional buck direct current choppers which output low frequency positive half cycle unipolar sine pulse width modulating voltage wave and low frequency negative half cycle unipolar sine pulse width modulating voltage wave respectively in the form of differential circuits. LC filters are connected between an output end of a differential chopper and an output load and between an input direct current power supply and an input end of the differential chopper. The high frequency link inverter can transform an unstable direct current voltage into a required stable good-quality sine alternating current voltage, the high frequency link inverter has the advantages of high frequency electric isolation, strong matching ability of input voltage and output voltage, simple circuit topology, single stage power transformation, bidirectional power flow, high power density, high transformation efficiency, less output voltage ripple, strong load adaptability, low audio frequency noise, low cost, wide application prospects and the like and provides the key technology for a novel inverter power supply and a static convertor.

Description

technical field [0001] The invention relates to a differential step-down (Buck) DC chopper type high-frequency link inverter, which belongs to the technical field of power electronic conversion. Background technique [0002] The inverter is a static conversion device that uses power semiconductor devices to convert direct current into alternating current for use with alternating current loads. An inverter with high-frequency electrical isolation between the output AC load and the input DC power supply is called a high-frequency link inverter. The high-frequency electrical isolation components mainly play the following roles in the inverter: 1) realize the electrical isolation between the output and input of the inverter, and improve the safety, reliability and electromagnetic compatibility of the inverter operation; 2) realize The matching between the output voltage and the input voltage of the inverter is achieved, that is, the technical effect that the output voltage of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/797H02M1/14
Inventor 王国玲陈道炼
Owner FUZHOU UNIV
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